Pen



FIG. 1 is a top, front, left-side perspective view of a pen in accordance with our new design;

FIG. 2 is a bottom, rear, left-side perspective view of the pen shown in FIG. 1;

FIG. 3 is a front elevational view of the pen shown in FIG. 1;

FIG. 4 is a rear elevational view of the pen shown in FIG. 1;

FIG. 5 is a left-side elevational view of the pen shown in FIG. 1;

FIG. 6 is a right-side elevational view of the pen shown in FIG. 1;

FIG. 7 is a top plan view of the pen shown in FIG. 1; and,

FIG. 8 is a bottom plan view the pen shown in FIG. 1.

The broken lines shown in the drawings represent portions of the pen that form no part of the claimed design. 

CLAIM The ornamental design for a pen, as shown and described. 